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FROM node:lts-slim

LABEL description="Simple Signing Service"

# Update the OS and install required dependencies
RUN apt-get update && \
    DEBIAN_FRONTEND=noninteractive apt-get upgrade --assume-yes -o Dpkg::Options::="--force-confold" && \
    DEBIAN_FRONTEND=noninteractive apt-get install --assume-yes --no-install-recommends ca-certificates openssl && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

# Add SSS
ENV NODE_ENV=production
RUN mkdir /SSS
COPY --chown=node:node package.json simple-signing-service.js swagger.js swagger.json /SSS/

WORKDIR /SSS
RUN npm install

# Remove Node package managers and its dependencies and clear apt cache
RUN rm -rf /usr/local/lib/node_modules/ \
    && rm -rf /usr/local/bin/npm \
    && rm -rf /usr/local/bin/npx \
    && rm -rf /opt \
    && rm -rf /var/cache/apt/archives
    
USER node

ENTRYPOINT ["node", "/SSS/simple-signing-service.js"]
